All i need is exactlly that cheap a$$ robot arm with low accuracy with a small motor with 1 foot range

Then go for it.

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as RaiRaiRai asked a while ago"Is it really difficult to program arduino make whatever form from .stl files in order to CNC machine them with this kind of robotic arm?"

Do you know what an stl file looks like? It's a collection of triangles, each of which has a normal. What, exactly, would you want to do with it?

You could import an stl file into a CAM system, and generate tool paths, and export that data as M and G codes, and then write a program to send those codes to the Arduino.

However, the Arduino makes a pretty lousy reverse kinematics solver, so it will take a while to get the necessary joint angles to move the servos to, to get the end-effector in the proper place/orientation.